How do we know that Christ's redemption is sufficient for salvation?

The sufficiency of Christ's redemption is rooted in the doctrine of substitutionary atonement. In Exodus 30, the ransom money required from each Israelite symbolizes the price of sin which only Christ could pay. He offered Himself as the perfect sacrifice, thus fulfilling the justice of God and securing salvation for His people. As the scripture declares, we are not redeemed with corruptible things but with the precious blood of Christ. His complete work on the cross ensures that all for whom He died are accounted righteous before God.